Put every water treatment quote on the same page.

Step 1 · Write the same brief for every provider

Describe the concern in plain language, attach the available water results and explain how the household uses water. Name any practical constraint that would rule out a proposal, such as the intended installation location or a requirement to preserve an existing treatment stage. Ask each provider to identify what additional information is needed. Keep personal information limited to what is necessary for the quote.

• The current source: public supply, private well or not yet confirmed.
• What has been observed and which results have actually been measured.
• The intended treated outlets and any equipment you want retained.
• Property access and practical conditions the provider should assess.

Step 2 · Request identifiable evidence

A broad phrase such as whole-home treatment does not identify what a system is designed to do. Write the manufacturer and exact model for every stage. Ask for the performance document that supports the objective in your brief. NSF’s guidance is useful here: a standard number is not a quality ranking, and certification must be checked against the specific reduction claim.

• The model on the quote should match the supporting document.
• Operating conditions and capacity should be visible, not implied.
• For a claim that matters to your decision, keep the document or listing link.

Source context: NSF · Standards and specific reduction claims

Step 3 · Compare the installed scope

Separate equipment selection from the work needed to put it into service. Ask for inclusions, exclusions and the process for approving changes discovered during installation. One proposal may include a task another leaves to you; that is a difference to price and plan, not necessarily a sign of poor quality. Keep the comparison factual and ask each provider to fill gaps.

• Connections, bypass, drainage and electrical work where applicable.
• Permitting or other local requirements: who determines and arranges them.
• Removal, cleanup, startup and owner instruction.
• Any follow-up visit or verification described in the agreement.

Step 4 · Use one ownership period

For a simple five-year planning worksheet, total the upfront installed charges, any scheduled payments over 60 months, and the estimated consumables and service for that period. Show taxes, financing charges or other contract costs when applicable. Do not count a financed equipment charge both upfront and again in payments. Label estimates and record what is still excluded; this is an organization method, not a prediction of savings.

• Five-year planned cost = upfront charges + scheduled payments + estimated consumables + estimated service + other applicable charges.
• Use each provider’s written assumptions rather than inventing replacement intervals.
• State the equipment ownership at the end of the period.
• Show uncertain costs separately instead of treating unknown as zero.

Step 5 · Clarify the warranty and service handoff

Ask who you contact for a problem, which party authorizes a repair and whether parts, labor, travel and consumables have different terms. Record conditions that matter, including required care or registration. A warranty headline alone cannot describe the whole agreement. If you plan to move or alter the system, ask how that affects the agreement before relying on transfer or cancellation assumptions.

• Provider responsible for the first service call.
• Coverage duration for each covered component and type of work.
• Requirements the owner must fulfill and documents to retain.
• Written response to the specific scenario you are concerned about.

Step 6 · Choose by requirements before preferences

Mark the requirements each proposal answers, the questions still open and the optional features you value. Resolve a required treatment or installation question before using a score to pick a winner. Once proposals address the same required outcome, compare the documented costs, responsibilities and preferred features. Keep the final decision notes so that the agreed configuration can be checked at handover.

• Required: a documented answer is needed before choosing.
• Preference: useful, but you decide how much it matters.
• Unknown: request clarification; do not assign an automatic zero.
• Accepted: keep the answer and the dated document that supports it.